Look in the Support / OM_DarkWaters_AddIns folder, and you will find several files (ods) of spreadsheets that have all sorts of mod info. The IIB and IIC overlapped, and the IIC and IID overlapped, as well as being available at different locations. This was due, of course, to the changing conditions during the war.
You will NOT get boat upgrades in Dark Waters, because they were not in OM. The game is very strange with the "upgrades", so lurker disabled them. When Fifi tried to implement them, they were odd, hence leaving them disabled.
